Hoping that you can help identify this 10 Heller, Carmine with black numerals (10 on top), Overprint on bottom (20 PARA 20) and Perfin that look to be "B I O".
See pics. Thank you all in advance for your assistance.
Also I don't see any "Varnish Bars" on this stamp. I have others which do have the bars so I am familiar with that aspect but I am confused about the Overprint and the Perfin, specifically does that change the catalog number for a stamp?
Thank you very much BeeSee for the informative webpage link! I love how philately is often in direct relation with the relatively modern history of nations, empires and states.
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